Idioms
The language peculiar to a people or to a district, community, or class
Idiom:
know (someone or something) like the back of one's hand
Meaning:
to know someone or something very well
Example:
I know the material for the exam like the back of my hand.
List of common idioms, their meanings and examples of their usage in sentences
An idiom is defined as - a group of words whose meaning is different from the meanings of the individual words.